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Write the number of periods and groups i...

Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving
from left to right in a period, and

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### Step-by-Step Solution: 1. **Identify the Structure of the Modern Periodic Table**: - The modern periodic table is organized into groups and periods. - Groups are the vertical columns, while periods are the horizontal rows. 2. **Count the Number of Groups and Periods**: - In the modern periodic table, there are **18 groups**. ...
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